ICD-10-CM 2027
ICD-10 code for phobia
From the official ICD-10-CM alphabetic index entry “Phobia, phobic”. Page updated September 29, 2026.
About coding phobia
The ICD-10-CM code for phobia is F40.9 (Phobic anxiety disorder, unspecified). The official index lists 27 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on F40.9.
Within F40, choose F40.9 (Phobic anxiety disorder, unspecified) only when documentation doesn't support a more specific option: agoraphobia (F40.0), social phobias (F40.1), specific (isolated) phobias (F40.2) and other phobic anxiety disorders (F40.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 882 (Neuroses Except Depressive, relative weight 0.9952), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific phobia codes (official index)
- animal F40.218 — Other animal type phobia
- spiders F40.210 — Arachnophobia
- examination F40.298 — Other specified phobia
- reaction F40.9 — Phobic anxiety disorder, unspecified
- simple F40.298 — Other specified phobia
- social F40.10 — Social phobia, unspecified
- generalized F40.11 — Social phobia, generalized
- specific (isolated) F40.298 — Other specified phobia
- animal F40.218 — Other animal type phobia
- spiders F40.210 — Arachnophobia
- blood F40.230 — Fear of blood
- injection F40.231 — Fear of injections and transfusions
- injury F40.233 — Fear of injury
- men F40.290 — Androphobia
- natural environment F40.228 — Other natural environment type phobia
- thunderstorms F40.220 — Fear of thunderstorms
- situational F40.248 — Other situational type phobia
- bridges F40.242 — Fear of bridges
- closed in spaces F40.240 — Claustrophobia
- flying F40.243 — Fear of flying
- heights F40.241 — Acrophobia
- specified focus NEC F40.298 — Other specified phobia
- transfusion F40.231 — Fear of injections and transfusions
- women F40.291 — Gynephobia
- specified NEC F40.8 — Other phobic anxiety disorders
- medical care NEC F40.232 — Fear of other medical care
- state F40.9 — Phobic anxiety disorder, unspecified
Common questions about phobia ICD-10 codes
What is the ICD-10 code for phobia?
- F40.9 — Phobic anxiety disorder, unspecified. More specific codes apply when the documentation supports them: F40.218, F40.210, F40.298, F40.9 and others below.
What is the ICD-10 code for animal phobia?
- F40.218 — Other animal type phobia.
What is the ICD-10 code for examination phobia?
- F40.298 — Other specified phobia.
What is the ICD-10 code for reaction phobia?
- F40.9 — Phobic anxiety disorder, unspecified.
What is the ICD-10 code for simple phobia?
- F40.298 — Other specified phobia.
What is the ICD-10 code for social phobia?
- F40.10 — Social phobia, unspecified.
What is the ICD-10 code for specific phobia?
- F40.298 — Other specified phobia.
Is F40.9 billable?
- Yes. F40.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F40.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F40.9 as a principal diagnosis.
Is F40.9 a CC or MCC?
- No. F40.9 is neither a CC nor an MCC under MS-DRG v44.0.